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Precautions For Hose Crimping Machine

Precautions for hose crimping machine: With its performance, the crimping machine is used in construction machinery, vehicles, hydraulic machinery, welding and cutting equipment and other industries, and has been favored. During use, Operators can easily overlook some operating procedures 1. The operator must operate in accordance with the process regulations. 2. The power supply must be cut off after the machine is stopped. 3. When changing the mold, it must be done after the shutdown. 4. The joint surface of the mold seat and the mold should be kept clean, and there should be no hard objects such as metal shavings. 5. Pour lubricating oil on the inclined surface of the mold base before starting the machine. 6. The positioning screws must be tightened before installing the module. 7. The pressure regulating valve must be adjusted under the specified pressure. 8. It is strictly forbidden to reach inside when working. 9. The electrical safety regulations must be observed when overhauling electrical parts.

04-07

2021

Precautions For Hose Crimping Machine
Precautions For Hose Crimping Machine

The Original Analysis Of the Damage Of The High Pressure Hose Assembly

The Original Analysis Of the Damage Of The High Pressure Hose Assembly  The high pressure hose assembly has problems during use, mainly due to the following aspects: 　　 1. Production quality: 　　 1. The vulcanization of the high-pressure hose does not reach the positive vulcanization, and the manifestation is under-sulfur or over-sulfur. Due to the above two reasons, its various attributes and functions cannot meet the requirements, which leads to problems in the use process. 　　2. The wall thickness of the hose is uneven, especially the inner rubber layer has the greatest impact. 3. The steel wire braiding or winding process did not follow the design process, the braiding angle did not reach 54 degrees 44 minutes, the steel wire braiding was too tight or too loose, the deformation of the high pressure hose (after pressure) (elongation, shortening or bending deformation) The amount) is larger. 　　4. Poor airtightness of the outer rubber layer leads to steel wire corrosion. 　　5. The inner layer of rubber has poor sealing performance, which makes it easy for high-pressure oil to enter the steel wire layer. 　　 6. The adhesive layer and the steel wire layer have insufficient adhesion. 　　 2. Blind production, no further improvement in accordance with the environmental or technical requirements, and the performance of the high-pressure hose cannot meet the specific environmental or technical requirements. This aspect is rare, but as long as it is mentioned, attention should be paid. 　　 Three. Quality problems of matching crimping joints: 　　 1. The material of the crimping joint does not meet the requirements. 　　 2. The process design of the crimping joint fails to meet the requirements. 　　 Fourth, the withholding is not in place, for example, the amount of withholding is not enough. 　　 5. The high-pressure hose assembly is not installed properly or installed correctly. 　　6. ​​The inside of the high-pressure hose assembly must be kept clean. If foreign matter (dust) enters the pump or valve, it will affect the normal operation of other equipment and indirectly affect the high-pressure hose assembly.

04-06

2021

The Original Analysis Of the Damage Of The High Pressure Hose Assembly
The Original Analysis Of the Damage Of The High Pressure Hose Assembly

How To Choose A Hydraulic Rubber Hose?

How to choose a hydraulic hose? Determination of technical indicators: to understand the needs of the product, and then determine the main indicators of the hydraulic hose according to the needs. For example: working pressure, hydraulic hose inner diameter, hydraulic hose outer diameter, hydraulic hose transport medium, use environment, service life, length dimension, minimum bending radius, etc., list a detailed table to determine the required hydraulic hose Technical indicators. Here is how to choose from these 8 aspects: 1. Working pressure: This depends on the maximum working pressure and whether it can meet the requirements. Don't ask too much when choosing, just use enough. 2. The inner diameter of the hydraulic hose: to ensure that the medium transmitted in the hydraulic hose can be transmitted smoothly without clogging, and it should be selected according to the diameter of the applied product, and it should not be too large or too small; 3. The outer diameter of the hydraulic hose: Choose according to the size of the applied product caliber, not too large or too small, to ensure that it can be assembled normally and does not leak; 4. Delivery medium: This is very important, we must pay attention to it. Choose the corresponding hydraulic hose when choosing. For example, if the delivery medium is hydraulic oil, choose hydraulic oil resistant when choosing; 5. Use environment: Choose the hose according to the use environment, see whether the environment is harsh, whether it is in the open air, the light time, whether it is frequent friction, the external temperature, etc. 6. Service life: According to the requirements of the product, choose the appropriate service life, and consider the difficulty and cost of replacement of the hydraulic hose when the service life is up; 7. Length size: According to the size of the product and the specific conditions of use, select the appropriate length size, try to be just right, and not allow it to be excessively bent or kept in a state of vigorous tension all the time; 8. Minimum bending radius: Because the hydraulic hose has a minimum bending radius when in use, it is necessary to consider the specific location of the product using the hydraulic hose and determine the appropriate minimum bending radius, so that the normal use environment of the hydraulic hose does not exceed Minimum bending radius.

04-05

2021

How To Choose A Hydraulic Rubber Hose?
How To Choose A Hydraulic Rubber Hose?

Common Failures And Cause Analysis Of Hydraulic Hoses

Common Failures And Cause Analysis Of Hydraulic Hoses Hydraulic hose is an important part of construction machinery such as concrete pumps, excavators, loaders, etc. However, it is often not valued by people. When there are leakage, cracks, cracks, loosening and other faults in use, it is often not analyzed The reason for the failure is simply to replace the hose, and the same failure will be repeated shortly after use. The loosening or rupture of hydraulic hoses not only wastes oil and pollutes the environment, but also affects work efficiency, and even causes accidents, endangering the safety of humans and machines.   Reasons for failure analysis of hydraulic hoses: improper use, unreasonable system design and unqualified hose manufacturing, etc.   I will discuss it in detail below based on my experience in actual work.   First, analyze the characteristics of the pipe. The hoses are divided into rubber hoses and plastic hoses. Plastic hoses are cheap and easy to install, but they have poor carrying capacity and are easy to age. They are only suitable for oil return pipes or drain pipes. Rubber hoses are divided into high pressure hoses and low pressure hoses. High pressure hoses are generally composed of It is composed of four parts: outer rubber layer, steel wire reinforcement layer, middle rubber layer and inner rubber layer. The inner rubber layer is in direct contact with the hydraulic oil, and one is made of synthetic rubber. The bearing capacity of the hose depends on the reinforcing layer, which is the skeleton of the hose, usually braided or wound with steel wires. Most of the medium and high pressure use steel wire braid as the skeleton, and the high pressure and ultra high pressure mostly use the steel wire winding skeleton. The outer rubber layer is generally made of rubber with good abrasion resistance and corrosion resistance to ensure that the reinforcement layer is not mechanically damaged, chemically corroded, damp and rusted. The low-pressure hose uses braided cotton and twine instead of braided steel wire, and is generally used for low-pressure oil return. pipeline.   Hose failures are generally manifested in the following four aspects: failure of the outer rubber layer, failure of the inner rubber layer, failure of the reinforcement layer, failure of the rupture. The causes and countermeasures of hydraulic hose failure are as follows:   1. Failure of the outer rubber layer   (1) Cracks appear on the outside of the hose   The main reason for the appearance of cracks in the hose is that the hose is bent in a cold environment. If you find cracks on the outside of the hose, pay attention to observe whether there are cracks in the inner rubber of the hose and decide whether to replace the hose immediately. Therefore, do not move the hose or dismantle the hydraulic system at will in a cold environment, and do it indoors if necessary. If you need to work in a colder environment for a long time, you should switch to a cold-resistant hose.   (2) The bubbling on the outer surface of the hose is caused by the unqualified production quality of the hose or improper use during work. If bubbling occurs in the middle of the hose, it is mostly a hose production quality problem, and qualified hoses should be replaced in time; if bubbling occurs at the joint of the hose, it may be caused by improper installation of the joint. There are often two types of hose joints: detachable and withholding. The detachable pipe joint is made into a hexagonal shape on the outer jacket and the joint core, which is convenient for frequent disassembly and assembly of the hose; the crimping pipe joint is composed of the joint jacket and the joint core, and the outer rubber layer must be peeled off during assembly, and then crimped on the special equipment , So that the hose can get a certain amount of compression.   (3) The hose is not broken but a large amount of oil seepage. The hose has a lot of oil seepage but no rupture is found. The reason is that the inner rubber is eroded and scratched when the high pressure liquid flows in the hose, until the large area of ​​the steel wire layer leaks out. Oil oozing. This failure usually occurs at the bend of the pipe, the hose should be checked and replaced, and the bend radius of the hose should meet the technical requirements during use.   (4) The outer rubber layer of the hose is severely deteriorated, and the surface has microcracks. This is a manifestation of the natural aging of the hose. Due to aging and deterioration, the outer layer is continuously oxidized to make the surface covered with a layer of ozone, which thickens with time. As long as the hose is slightly bent during use, tiny cracks will occur. In this case, the hose should be replaced.   2. Failure of the inner rubber layer   (1) The inner rubber layer of the hose is hard and cracked: the main reason is that the rubber product is added with a plasticizer to make the hose flexible and plastic. But overheating

04-03

2021

Common Failures And Cause Analysis Of Hydraulic Hoses
Common Failures And Cause Analysis Of Hydraulic Hoses

How To Extend The Service Life Of High Pressure Hose?

How to extend the service life of high pressure hose? The service life of the hydraulic hose assembly depends on its usage conditions. In order to prolong the service life of the high-pressure hose, the hose assembly in use should be checked regularly for leaks, kinks, blistering, scratches, abrasion, or other damage to the outer rubber layer. When the assembly is found to be damaged or worn, it must be replaced immediately. The service life of the assembly can be extended by the following measures: 1. Use factors: 1. Installation of the hose assembly: The installation of the hydraulic hose assembly should comply with the relevant standards of SAEJ1273 on the direction and arrangement of hydraulic hoses to ensure that the hose assembly is used correctly. 2. Working pressure: The pressure of the hydraulic system should not exceed the rated working pressure of the hose. The pressure rise or peak value that exceeds the rated working pressure is extremely destructive and must be considered when selecting a hose. 3. Minimum burst pressure: The burst pressure mentioned in this catalog is limited to destructive tests to determine the design safety factor. 4. Temperature range: Do not use the hose under temperature conditions (including internal and external temperatures) exceeding the recommended limit. If the hydraulic fluid used contains emulsion or solution, please refer to the relevant technical data separately. Regardless of the operating temperature range of the hose, it must not exceed the maximum operating temperature recommended by the fluid manufacturer. 5. Fluid compatibility: The hydraulic hose assembly (inner rubber layer, outer rubber layer, reinforcement layer and hose joints) must be compatible with the fluid used. Proper hoses must be used because the chemical properties of phosphate-based and petroleum-based hydraulic fluids are completely different. Many hoses are suitable for one or more fluids, but not all fluid types. 6. Minimum bending radius: Do not bend the hose to less than the recommended minimum bending radius, nor subject the hose to tension or torque. This may cause the reinforcement layer to withstand excessive stress and greatly reduce the hose's ability to withstand pressure . 7. Hose size: The size of the hose (inner diameter) must be able to handle the required flow rate. If the inner diameter is too small at a specific flow rate, it will cause excessive fluid pressure and heat generation, causing damage to the inner rubber layer. 8. Hose direction arrangement: The hose should be restrained, protected or guided (use pipe clamps when necessary) to minimize the risk of damage to the ring caused by excessive bending, shaking, or contact with moving parts or corrosive substances. Determine the appropriate hose length and joint form to prevent wear, avoid contact with sharp objects and twist, so as to achieve a leak-proof connection. . 9. Hose length: When determining the correct hose length, the length changes under pressure, machine vibration and movement, and when the hose assembly is wired should be taken into consideration. 10. Hose application: Choose the appropriate hose according to the specific application. 2. Environmental factors: The storage environment, together with the rubber material, can change the storage life of the hose. The specific service life is difficult to quantify because there are many factors that affect the hose. If the storage measures are proper, the storage life can reach 3-5 years. Beyond this time, the service life of the hose will be greatly reduced, depending on various factors in the storage environment, including: 1. Temperature: The hose should be stored in a cool and dry place, and the temperature must not exceed +100°F (+38°C). If it is stored at a temperature below freezing point, it may need to be preheated after being taken out before it can be processed, tested and put into use. 2. Direct sunlight, rain, heater or close to electrical equipment. 3. Humidity and ozone. 4. Oil, solvent, corrosive materials or flue gas. 5. Insects or rodents. 6. Radioactivity. 7. Available space and whether there is bending. Three, storage factors 1. The hose should be stored in the original container. Don't pile it too high, otherwise its own weight will crush the bottom hose. 2. It is recommended to perform visual inspection and testing before using hoses that have been stored for a long time. Hoses judged to be in bad condition should be replaced to avoid failure, property damage or personal injury. The warehouse shall be managed according to the first-in first-out principle. Excessive storage time and poor environment will cause the hose grade to drop, performance degradation and premature failure.

04-03

2021

How To Extend The Service Life Of High Pressure Hose?
How To Extend The Service Life Of High Pressure Hose?

　The influence of hose assembly cleanliness on hydraulic system

　The influence of hose assembly cleanliness on hydraulic system Hydraulic system requires high cleaned hydraulic oil. 75% failure of hydraulic system are due to exceeding solid particle in hydraulic oil. Main pollution resource are rubber particles and scraps during hydraulic assembly processing. 　　Hydraulic assembly processing caused the main pollution,especially mental scraps and rubber particles during hose cutting or skiving. There are three basis standards to check cleanliness: ISO4406,ISO4405 and NAS1638, and ISO4406 is the most common one which can divided different grades according to the number and size of solid particle contaminants in hydraulic system. 　　In order to keep hose clean,all hydraulic assembly should be cleaned with proper cleaning equipment.BNTFLEX cleaning equipment BNT200H is a good choice, and this equipment can clean hose inwall with leaner which contains rust inhibitor, and then blowing the leaner with high-pressure gas.

04-02

2021

　The influence of hose assembly cleanliness on hydraulic system
　The influence of hose assembly cleanliness on hydraulic system

How to select hydraulic hose

How to select hydraulic hose   Hydraulic hose is an important link in the hydraulic system and equipment. It can bear high pressur, easy to remove, and very widely used in hydraulic industry.   Hydraulic hose consists of the inner and outer rubber layer and steel wire layer. There are different layer of steel wire from 1 to 6 according to the pressure it can bear, and the maximum pressure is 60mpa.Hydraulic hose inner is made of synthetic rubber which resistant to mineral oil and bio-oil and with good shrink performance. Outer layer is made of wear-resisting and aging-resisting rubber. Middle layer is high tensile steel wire winding layer. Suitable medium for hydraulic hose include : mineral oil, oil-water mixture, polyethylene glycol based oil, synthetic lipid based oil, rapeseed oil and so on. Application working temperature is -40℃ to 100℃, maximum temperature is 125℃.   Selecting hydraulic hose correctly can ensure the safety of the whole hydraulic system, Layout space reasonably, and control the costs preferably.Pay attention to the following 4 points when selecting:   1. Select steel wire layer according to pressure, the more of steel wire layer, the higher pressure can take.Every hydraulic hose has a maximum working pressure,bursting pressure is 4 times as working pressure. The pressure is higher, the price is higher ,so choose the right hose  according to practical system pressure. We advice you choose impulse resistant hose if hydrualic system whose impact pressure appears very frequently.   2．Select right inner diameter base on the flow, and It’s important to choose inner diameter accordingly.Undersized inner diameter will increase the speed of flow, reduce efficiency and over high decompression. On the other side, oversize inner diameter will increase cost.   3.Pay attention to the bending radius of hose.It’s better to minus crimping length when calculate bending radius, to withhold length minus front joint.It will reduce the pressure-bearing ability and working life if bend radius is too small.   4. Select reasonable fittings according to the hydraulic arrangement.For example : SAE flange fittings, internal thread fittings, external thread fittings, 90° and 45° fittings assembly angle and hose assembly angle.

04-01

2021

How to select hydraulic hose
How to select hydraulic hose

Cleaning Methods: Fuel Tanks of Construction Machinery

Cleaning Methods: Fuel Tanks of Construction Machinery Most of the construction machinery to diesel engine as the driving force, due to poor operating conditions, the fuel tank is easy to mix with dust or rain and snow, diesel pollution. In addition, the fuel tank of diesel and air tank wall and long-term contact, will gradually generate some dirt into the bottom of the tank or attached to the wall. These factors will cause the fuel system precision coupling accidental wear and tear, so the diesel engine should be cleaned once every 600h oil tank. Construction machinery on the tank tall and bulky, can not always be removed to clean. Some imported machines, such as the Caterpillar 613C scraper, are welded together with the bucket's support frame and can not be disassembled at all. This kind of scraper is very strict to the cleanliness of diesel oil. Many machine operators have to take the oil in the net oil tank, and then open the oil drain switch after cleaning the diesel oil until the diesel oil is out of the stolen goods. This cleaning the tank is a waste, but also can not attach the tank wall clean. To this end we have made a clean air tank with compressed air nozzle. The nozzle is a 1m long thin steel pipe, the bottom of the block with the end, around the bottom of the drill a few 1mm diameter holes. Use the nozzle, do not have to remove the tank, a few minutes to clean the internal tank. 1 Cleaning method (1) Open the oil tank oil drain switch and put the finished oil, while closing the oil drain switch and oil supply switch, remove the tank cap, oil filter and oil dipstick, to the tank into 20 ~ 40L clean diesel as cleaning Oil (depending on the size of the fuel tank). (2) Connect the pump hose to the nozzle and lower the nozzle into the bottom of the tank. When the air pump cylinder air pressure rose to 0.6 ~ 0.7MPa, open the gate valve, so that high-speed air from the hole into the bottom of the oil reservoir, so that diesel fuel and splash up, so that the internal tank scouring. In the cleaning process, the gas cylinder pressure should be maintained at 0.4 ~ 0.5MPa. To prevent the oil mist out of the tank, use gauze to block the tank mouth, so as not to affect the nozzle swing is appropriate. (3) Close the reservoir valve, remove the nozzle, clean the oil tank clean oil, plus 15 ~ 30L clean diesel, according to the above method and then cleaned 1 times. After cleaning, release the cleaning oil, install the oil filter, oil dipstick and fuel tank cover, thus completing the tank cleaning work. Released cleaning oil can be used after the precipitation of other tanks or parts of the cleaning. 2 Note For the proper use of diesel fuel tank, should also note the following points: (1) Diesel fuel in the tank should be added before the precipitation of more than 48h. (2) before each shift should open the oil tank oil discharge switch, the bottom sediment release. (3) the operation to pay attention to master the fuel tank in the oil, so as not to run out of oil to the air into the fuel system, affecting the normal work of the machine. (4) should be filled with diesel after work every day, so as not to empty the inner wall of the tank due to condensation of water droplets sinking into the diesel fuel, the fuel system of precision parts even premature corrosion. (5) the tank cover ventilation holes should always clear, so as to avoid negative pressure within the tank to reduce oil pressure, reduce the fuel supply, resulting in machine power down or unstable operation.

04-01

2021

Cleaning Methods: Fuel Tanks of Construction Machinery
Cleaning Methods: Fuel Tanks of Construction Machinery

The possible failure of the inner layer of high pressure hydraulic hose and its solution

The possible failure of the inner layer of high pressure hydraulic hose and its solution 1, the rubber hose within the hard layer, crack: As the rubber products by adding a plasticizer, so flexible plastic tube. Hose in high temperature, high pressure, the hose overheating, plasticizer will overflow. In addition, overheating of the oil through the system in the cylinder, valves or other components, if a greater pressure drop will lead to decomposition of oil, resulting in the hose layer of oxidation and hardening. In this case, you should first check the hydraulic system operating temperature is normal, the valve throttling, the pump suction duct is smooth, etc., in the exclusion of all factors that may lead to oil temperature and oil decomposition after the replacement of the hose. If only the hose under the rupture of the hard rubber and the top of the well maintained, this indicates that the hose rupture at the excessive extrusion, bending too fast or reverse phenomena such as oil heating and speed up oxidation, will cause the plastic hair hard . 2, the hose inner layer of serious deterioration, significant swelling: hose inner layer of serious deterioration, significant swelling due to the use of hydraulic oil over time or oxidized deterioration of the dirt is present in the hydraulic system, the hose by the chemical effect Deterioration, will be found in the oil back to the broken pieces of rubber. If this happens, should check the physical and chemical indicators of hydraulic oil, check the system fluid and hose glue material compatibility and working temperature is in line with standards.

03-31

2021

The possible failure of the inner layer of high pressure hydraulic hose and its solution
The possible failure of the inner layer of high pressure hydraulic hose and its solution
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